Transcript for 'Titanic' Movie Revisited: Could Jack Have Stayed Alive?

And finally tonight we can all replay those scenes in our head. Jack and rose on the "titanic" riding the ship down and floating in the icy waters of the atlantic but what if there was something simple. What if there were a way jack could have been kept alive. Enter a new experiment and a 13r50izing answer. Abc's david wright explains. I promise. Reporter: Spoiler alert. In case you're the one person on the planet who hasn't seen "titanic" -- I'll never let go jack. Reporter: Jack doesn't make it. He freezes to death in the icy atlantic so that rose can survive. But was that as it had to be? Hey, james. Reporter: Last night on the discovery channel "titanic" director james cameron turned to the mythbusters for help. These thousands of fans think I got it wrong and both could have been supported by the board and lived. This is what I want you to test. Reporter: The mythbusters tried it first in a bathtub with little jack and rose dolls. Then tried it for real in the open water. Jack's first attempts to get aboard the board seemed very similar to the movie. The board does appear to be only made for one. Reporter: Sure enough persistence pays off. Especially when they came up WITH A TWEAK WORTHY of MacGyver. You're wearing a life jacket. Let's say she spread the buoyancy around. Let's put it underneath and get every bit we can. Reporter: By latching it underneath the plank jack and rose would have been high and dry. We're rescued. We totally made it. I think you guys are missing the point here. Reporter: As the director points out sometimes the laws of drama trump the laws of physics. The script says jack dies. He has to die. Reporter: The ending for this movie had to include some tragedy. David wright, abc news, los angeles. And we thank you for watching

This transcript has been automatically generated and may not be 100% accurate.